What will be the set of chromosomes for tetraploid rye obtained from a diploid variety with a karyotype of 14 chromosomes?

Since the variety of rye, from which tetraploid rye is obtained (rye with a quadruple set of chromosomes), is diploid (double) by the condition of the problem, the number of chromosomes in the cells of tetraploid rye will amount, respectively, 14 * 2 = 28 chromosomes.

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